Firing pin block



FIG. 1 is a perspective view of a firing pin block embodying the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top, plan view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a sectional view of FIG. 2 taken along the lines 5—5. thereof. 

The ornamental design for a firing pin block, substantially as shown and described. 